Poe.com: Interact with GPT-4 Chatbot
https://poe.com/
Poe currently limits users to one free GPT-4 query per day.
Hugging Face: Access to Open Source ChaGPT-4
https://huggingface.co/spaces/ysharma/Chat
There may be a queue, so you may need to wait a few seconds or longer to receive a response.
Ora.sh: Unlimited ChatGPT-4 Usage
https://ora.sh/openai/gpt4
Use is available after logging in, with no restrictions or fees.
Nat.dev: Compare Machine Learning Models
https://nat.dev
Nat.dev limits users to a maximum of 10 queries per day.
AI Dungeon: Interactive ChaGPT-4 Experience
https://play.aidungeon.io/main/home
Microsoft Bing: AI Chat Powered by GPT-4
www.newbing.com
To use for free on Bing